Cleanup the fonts

[obulat]

Problem

There are several problems with the fonts in this repository that should be fixed:

• Delete unused font files #1782

• We should set the variable WOFF2 font as default and add non-variable fallbacks for older browsers. The Inter font files can be downloaded from the official website (https://rsms.me/inter/). The downloaded archive also contains some README files with samples of how to use them.
  There should still be the fallback to locally saved fonts, but those should have commas between them:
  

  openverse-frontend/src/assets/fonts.css

  Line 6 in bf0c72e

  src: local('Inter-Regular'), local('Inter Regular') local('Inter'),

  
  I couldn't find any usage italic anywhere, but we should still add italic in case we do need it later (this is for the fallback, variable fonts would probably have it anyway?)

Additional context

I've started looking into it after seeing that the fonts on a Windows laptop look different from the fonts on a Mac: the regular weight seems to be bold. I will look more into it and will create the issue.

Implementation

• 🙋 I would be interested in implementing this feature.